Product description "Small and practical, easy to use. This product will make your life easier and more convenient. feature: 1. Function for measuring electrical parameters (voltage, current, active power, electrical energy, frequency, power factor) 2. Overload alarm function (over-threshold power alarm, backlight and power flashing alarm) 3. Power alarm threshold preset function (power alarm threshold can be set) 4. Energy can use reset button 5. Power off to save data 6. Large LCD screen 7. Backlight function 8. Function keys Backlight control Short press the button to turn on or off the backlight, the backlight has a memory function, and the on or off state can be stored when the power is off. reset energy Step 1: Press and hold the button for 5 seconds until the energy flashes, then release the button. Step 2: Short press the key again, the energy value is reset to zero, and the flashing reset state is exited. Step 3: If there is no key operation within 5 seconds, it means the energy value is not cleared and exits the reset state. Setting the power alarm threshold Step 1: Press and hold the button until the LCD displays “SET CLr”, then release the button to enter the setting state. Step 2: The window displays the current power alarm value of Power, and the last digit starts flashing, which can be shortened by 1. If there is no operation for more than 3 seconds, it will automatically switch the position of the figure. method is the same as above. Step 3: After setting is completed, press and hold the button for 5 seconds to store and exit automatically. The active power threshold range is 0.0 to 2.5 kW. Six parameters can be displayed simultaneously. feature: Operating voltage: 80 ~ 260 VAC Test voltage: 80 ~ 260 VAC Rated power: 100A / 22000W Working frequency: 45-65Hz Measurement accuracy: class 1.0 Display format: 1. Power Test range: 0~22000W Starting power measured: 0.2 W <10W Display format: 1.00 ~ 9.99W <100 W Display format: 10.0 to 99.9 W <1000W Display format: 100~999W <10000W Display Format: 1.00~9.90kW ≥10000W Display format: 10.0~22.0kW 2. Energy Test range: 0~999kWh <1kWh Display format: 0~999Wh <10 kWh Display format: 1.00 to 9.99 kWh ≥10kWh Display format: 10~999kWh 3. Voltage Test range: 80~260V Display format: 80~260V 4. Current Test range: 0~100A Measurement start current: 0.001 A <10A Display format: 0.000~9.000A ≥10A Display format: 10.00~99.99A 5. Frequency Test range: 45~65Hz Display format: 45~65Hz 6. Power Factor Test range: 0~1PF Display Format: 0.00~1.00PF Precaution: 1. This module is suitable for indoor use, please do not use it outdoors. 2. The external load should not exceed the rated power. 3. The wiring cannot be wrong. Package includes: 1 * ammeter Size: 9*5*2.5cm